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-rw-r--r--arch/x86/kernel/amd_iommu.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index f2956546423..f2260609ead 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -923,6 +923,8 @@ static int device_change_notifier(struct notifier_block *nb,
struct protection_domain *domain;
struct dma_ops_domain *dma_domain;
struct amd_iommu *iommu;
+ int order = amd_iommu_aperture_order;
+ unsigned long flags;
if (devid > amd_iommu_last_bdf)
goto out;
@@ -955,6 +957,21 @@ static int device_change_notifier(struct notifier_block *nb,
goto out;
detach_device(domain, devid);
break;
+ case BUS_NOTIFY_ADD_DEVICE:
+ /* allocate a protection domain if a device is added */
+ dma_domain = find_protection_domain(devid);
+ if (dma_domain)
+ goto out;
+ dma_domain = dma_ops_domain_alloc(iommu, order);
+ if (!dma_domain)
+ goto out;
+ dma_domain->target_dev = devid;
+
+ spin_lock_irqsave(&iommu_pd_list_lock, flags);
+ list_add_tail(&dma_domain->list, &iommu_pd_list);
+ spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
+
+ break;
default:
goto out;
}